RAID Server refers to Redundant Array of Inexpensive Servers (RAIS). RAID Servers is the use of multiple servers to provide the same service in such a way that service will still be available if the servers fails. RAIS stripes and mirrors application code and memory across an array of ordinary servers using the standard RAID schemata of level 0, level 1, level 5, level 1+0. This is possible through the invention of a radical new memory management system called Versioned Memory.